Add Scheme extractor #4969

Job	Run time
check-docs	41s
check	2m 16s
cargo-public-api-crates (axum)	28s
cargo-deny check (advisories)	32s
cargo-public-api-crates (axum-core)	15s
cargo-hack	3m 31s
cargo-deny check (bans licenses sources)	22s
dependencies-are-sorted	34s
cargo-public-api-crates (axum-extra)	48s
cargo-public-api-crates (axum-macros)	19s
Spell Check with Typos	18s
armv5te-unknown-linux-musleabi	29s
test-nightly	1m 13s
test-docs	1m 15s
test-msrv	2m 28s
test-versions (stable)	2m 9s
wasm32-unknown-unknown	19s
test-versions (beta)	3m 52s
	21m 49s

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